EP0314145A1 - Verfahren zur Herstellung von Gegenständen aus hochzähem und hochfestem Stahl - Google Patents

Verfahren zur Herstellung von Gegenständen aus hochzähem und hochfestem Stahl Download PDF

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Publication number
EP0314145A1
EP0314145A1 EP88117947A EP88117947A EP0314145A1 EP 0314145 A1 EP0314145 A1 EP 0314145A1 EP 88117947 A EP88117947 A EP 88117947A EP 88117947 A EP88117947 A EP 88117947A EP 0314145 A1 EP0314145 A1 EP 0314145A1
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EP
European Patent Office
Prior art keywords
steel article
toughness
present
steel
strength
Prior art date
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EP88117947A
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English (en)
French (fr)
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EP0314145B1 (de
Inventor
Kazuaki C/O Nkk Corporation Matsumoto
Shin-Ichi C/O Nkk Corporation Suzuki
Hisatoshi C/O Nkk Corporation Tagawa
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JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
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Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys

Definitions

  • the present invrntion relates to a method for manufacturing a steel article having a high toughness and a high strength.
  • Mechanical parts such as automobile parts are usually manufactured by hot-forging a steel bar to prepare mechanical parts having a prescribed shape, and then applying a refining heat treatment comprising hardening and tempering, to the thus prepared mechanical parts.
  • the above-mentioned refining heat treatment which is applied for the purpose of imparting desired toughness and strength to the mechanical parts, requires large­scale facilities and a huge thermal energy. If, there­fore, the above-mentioned refining heat treatment can be omitted from the manufacturing process of the mechanical parts, it would permit simplification of the facilities and saving of thermal energy.
  • Prior Arts 1 to 4 have the following problems. More particularly, in the Prior Art 1, which permits achievement of a higher strength by adding vanadium and of a higher toughness by adding titanium, the high carbon content of from 0.20 to 0.40 wt.% imposes a limit in increasing toughness. In the Prior Arts 2, 3 and 4, which permit achievement of a higher strength as compared with the Prior Art 1, tough­ness is equal or inferior to that in the Prior Art 1. Particularly in the Prior Art 4, the high carbon content of from 0.06 to 0.15 wt.% poses difficulties in toughness.
  • An object of the present invention is therefore to provide a method for manufacturing a steel article having a toughness including a Charpy impact value at 25°C (uE25°C) of at least 15.0 kgf.m/cm2 and a Charpy impact value at -40°C (uE-40°C) of at least 10 kgf.m/cm2 and having a strength including a yield strength (YS) of at least 60 kgf/mm2 and a tensile strength (TS) of at least 80 kgf/mm2.
  • YS yield strength
  • TS tensile strength
  • a method for manufacturing a steel article having a high toughness and a high strength characterized by comprising the steps of: using a material comprising: where, the total amount of said manganese and said chromium being from 2.50 to 6.00 wt.%, and the balance being iron and incidental impurities, where, the amount of nitrogen as one of said incidental impurities being up to 0.006 wt.%; heating said material to the austenization temperature region; hot-working said material in the austenization temperature region to prepare a steel article; and cooling said steel article thus prepared from the austenization temperature region to a temperature of or lower than 300°C at a cooling rate of from 2 to 100°C/second, thereby imparting a high toughness and a high strength to said steel article.
  • Said material may further additionally contain as required the following elements:
  • Said material may further additionally contain as required at least one element selected from the group consisting of:
  • the present invention was achieved on the basis of the above-mentioned finding.
  • the method for manu­facturing a steel article having a high toughness and a high strength of the present invention comprises the steps of: using a material comprising: where, the total amount of said manganese and said chromium being from 2.50 to 6.00 wt.%, and the balance being iron and incidental impurities, where, the amount of nitrogen as one of said incidental impurities being up to 0.006 wt.%; heating said material to the austenization temperature region; hot-working said material in the austenization temperature region to prepare a steel article; and cooling said steel article thus prepared from the austenization temperature region to a temperature of or lower than 300°C at a cooling rate of from 2 to 100 °C/second, thereby imparting a high toughness and a high strength to said steel article.
  • Said material may further additionally contain as required the following elements:
  • Said material may further additionally contain as required at least one element selected from the group consisting of:
  • Carbon is an element having an important effect on toughness and strength. With a carbon content of under 0.020 wt.%, however, a sufficient strength cannot be obtained. With a carbon content of over 0.049 wt.%, on the other hand, a sufficient toughness cannot be obtained. Therefore, the carbon content should be limited within the range of from 0.020 to 0.049 wt.%.
  • Silicon has the function of deoxidation and of improving hardenability. With a silicon content of under 0.10 wt.%, however, a desired effect as described above cannot be obtained. A silicon content of over 1.00 wt.% leads on the other hand to a lower toughness. Therefore, the silicon content should be limited within the range of from 0.10 to 1.00 wt.%.
  • Manganese has the function of improving toughness and strength. With a manganese content of under 1.00 wt.%, however, a desired effect as described above cannot be obtained. A manganese content of over 3.50 wt.% results on the other hand in a lower toughness. Therefore, the manganese content should be limited within the range of from 1.00 to 3.50 wt.%.
  • chromium has the function of improving toughness and strength. With a chromium content of under 0.5 wt.%, however, a desired effect as described above cannot be obtained. A chromium content of over 3.50 wt.% leads on the other hand to a lower toughness. Therefore, the chromium content should be limited within the range of from 0.5 to 3.50 wt.%.
  • chromium and manganese With a total amount of chromium and manganese of under 2.50 wt.%, a sufficient strength cannot be obtained. A total amount of chromium and manganese of over 6.0 wt.% leads on the other hand to a lower toughness and a higher cost. The total amount of chromium and manganese should therefore be limited within the range of from 2.50 to 6.0 wt.%.
  • Vanadium has the function of improving strength. With a vanadium content of under 0.02 wt.%, however, a desired effect as mentioned above cannot be obtained. A vanadium content of over 0.20 wt.% leads on the other hand to a lower toughness. Therefore, the vanadium con­tent should be limited within the range of from 0.02 to 0.20 wt.%.
  • Aluminum has a strong function of deoxidation. With an aluminum content of under 0.01 wt.%, however, a desired effect as described above cannot be obtained. Even with an aluminum content of over 0.05 wt.%, on the other hand, no further improvement in the deoxidizing effect can be expected. Therefore, the aluminum content should be limited within the range of from 0.01 to 0.05 wt.%.
  • Nitrogen is an element inevitably entrapped into steel. Although the nitrogen content should preferably be the lowest possible, it is difficult to largely reduce the nitrogen content in an industrial scale. However, a nitrogen content of over 0.006 wt.% requires an increased amount of titanium added to fix nitrogen when additionally adding titanium, resulting in an increased amount of produced titanium nitride (TiN), which in turn leads to a further decreased toughness. Therefore, the amount of nitrogen as one of the incidental impurities should be limited up to 0.006 wt.%.
  • Boron has the function of improving hardenability. Boron is therefore further additionally added as required in the present invenion. With a boron content of under 0.0003 wt.%, however, a desired effect as described above cannot be obtained. Even with a boron content of over 0.0030 wt.%, on the other hand, no further improvement in hardenability is available. Therefore, the boron con­tent should be limited within the range of from 0.0003 to 0.0030 wt.%.
  • Titanium has the function of fixing nitrogen in steel to promote the hardenability improving effect provided by boron.
  • titanium is further additionally added as required.
  • a titanium content of under 0.005 wt.% however, a desired effect as described above cannot be obtained.
  • Even with a titanium content of over 0.030 wt.% there is no further improvement in the nitrogen fixing effect in steel.
  • a titanium content of over 0.030 wt.% causes excessive production of titanium nitride (TiN), resulting in a lower toughness. Therefore, the titanium content should be limited within the range of from 0.005 to 0.030 wt.%. In order to effectively fix nitrogen in steel, it is recommended to add titanium in an amount 3.4 times the nitrogen content.
  • Nickel has the function of improving toughness and strength. In the present invention, therefore, nickel is further additionally added as required. With a nickel content of under 0.05 wt.%, however, a desired effect as mentioned above cannot be obtained. A nickel content of over 1.00 wt.% leads on the other hand to a higher cost. Therefore, the nickel content should be limited within the range of from 0.05 to 1.00 wt.%.
  • the copper content should be limited within the range of from 0.05 to 1.00 wt.%.
  • Molybdenum has the function of improving toughness and strength. In the present invention, therefore, molybdenum is further additionally added as required. With a molybdenum content of under 0.05 wt.%, however, a desired effect as mentioned above cannot be obtained. A molybdenum content of over 0.50 wt.% leads on the other hand to a higher cost. Therefore, the molybdenum content should be limited within the range of from 0.05 to 0.50 wt.%.
  • Niobium has the function of improving strength. In the present invention, therefore, niobium is further additionally added as required. With a niobium content of under 0.005 wt.%, however, a desired effect as described above cannot be obtained. A niobium content of over 0.050 wt.% results on the other hand in a lower toughness. Therefore, the niobium content should be limited within the range of from 0.005 to 0.050 wt.%.
  • sulfur may be added in an amount of from 0.02 to 0.07 wt.%, or lead, in an amount of from 0.04 to 0.4 wt.% to improve machinability.
  • the material having the above-mentioned chemical composition is heated to the austenization temperature region for the purpose of achieving a sufficient hardening effect.
  • the above-mentioned material in the austenization temperature region is worked by hot-forging, for example, to prepare a steel article, and the thus prepared steel article is cooled from the austenization temperature region to a tempera­ture of or lower than 300°C at a cooling rate of from 2 to 100°C/second for the following reason.
  • a cooling rate of under 2°C/second a sufficient hardening effect is unavailable and satisfactory toughness and strength cannot be imparted to the steel article.
  • a cooling rate of over 100°C/second is, on the other hand, difficult to achieve industrially.
  • a steel bar made of steel (A) specified in Table 1 described later was heated to 1,250°C, and the steel bar in the austenization temperature region was hot-forged to prepare a plurality of test pieces. These test pieces were cooled from the austenization temperature region to 25°C at different cooling rates. The relationship between the cooling rate of these test pieces and Charpy impact value at -40°C (uE-40°C) and tensile strength (TS) of these test pieces was investigated. The result is shown in Fig. 1.
  • the mark “ ⁇ ” represents data on the test pieces made of steel (C), and the mark “ ⁇ ”, data on the test pieces made of steel (D).
  • a cooling rate of under 2°C/second results in a tensile strength of over the target value of the present invention of 80 kgf/mm2, but in a Charpy impact value of under the target value of the present invention of 10 kgf.m/cm2.
  • the lower limit value of cooling rate of the steel article is limited to 2°C/second.
  • the cooling arrest tem­perature of the steel article is limited to a temperature of or lower than 300°C for the following reason.
  • a cooling arrest temperature of over 300°C a sufficient hardening effect is unavailable, and a high toughness and a high strength cannot be imparted to the steel article.
  • a front axle beam for automobile was manufactured from steel (B), within the scope of the present invention, having the chemical composition as shown in Table 1, in the same manner as in the above-­mentioned case of steel A.
  • Test piece No. 6 was cut from the thus manufactured front axle beam, and mechanical properties of the test piece No. 6 was investigated.
  • the mark "*" contained in the column of No. represents a test piece of the present invention; absence of this mark, a test piece for comparison outside the scope of the present invention; temperature indicated in parentheses, a cooling arrest temperature; "YS”, a yield strength; “TS”, a tensile strength; “El”, an elongation; “RA”, a reduction of cross-section area; "uE-40°C”, a Charpy impact value at -40°C; and "uE25°C ⁇ , a Charpy impact value at 25°C. Also in the following tables, these symbols have the same meanings as in Table 2.
  • test pieces of the present invention Nos. 2 to 4 and 6 have a Charpy impact value at -40°C of at least 15 kgf.m/cm2 and a tensile strength of at least 84 kgf/mm2, thus showing a high toughness and a high strength.
  • the test piece for comparison No. 1 of which the cooling rate is outside the scope of the present invention, has a Charpy impact value at -40°C and a tensile strength lower than those of any of the test pieces of the present inven­tion.
  • the test piece for comparison No. 5, of which the cooling arrest temperature is outside the scope of the present invention shows a Charpy impact value at -40°C and a tensile strength lower than those of any of the test pieces of the present invention.
  • a front axle beam for automobile was manufactured from each of steels (C), (D), (E) and (F), within the scope of the present invention, having the chemical com­position as shown in Table 3, in the same manner as in Example 1.
  • Test pieces Nos. 7 to 19 were cut from these front axle beams, and mechanical properties of these test pieces were investigated. The results are shown in Table 4.
  • test pieces of the present invention Nos. 10 to 13 and 16 to 19 have a Charpy impact value at -40°C of at least 10 kgf.m/cm2 and a tensile strength of at least 87 kgf/mm3, thus showing a high toughness and a high strength.
  • test pieces for comparison Nos. 7 to 9 of which the cooling rate is outside the scope of the present invention, have a Charpy impact value at -40°C and a tensile strength lower than those of any of the test pieces of the present invention.
  • a front axle beam for automobile was manufactured from each of steels (G), (H), (I), (J) and (K), within the scope of the present invention, having the chemical composition as shown in Table 5, in the same manner as in Example 1. Test pieces Nos. 20 to 24 were cut from these front axle beams, and mechanical properties of these test pieces were investigated. The results are shown in Table 6.
  • test pieces of the present invention Nos. 20 to 24 have a Charpy impact value at -40°C of at least 13 kgf.m/cm2 and a tensile strength of at least 98 kgf/mm2, thus showing a high toughness and a high strength.
  • a front axle beam for automobile was manufactured from each of steels (L), (M), (N), (O), (P) and (Q), out­side the scope of the present invention, having the chemical composition as shown in Table 7, in the same manner as in Example 1.
  • Test pieces Nos. 25 to 30 were cut from these front axle beams, and mechanical properties of these test pieces were investigated. The results are shown in Table 8.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP88117947A 1987-10-29 1988-10-27 Verfahren zur Herstellung von Gegenständen aus hochzähem und hochfestem Stahl Expired EP0314145B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP271667/87 1987-10-29
JP62271667A JPH0696742B2 (ja) 1987-10-29 1987-10-29 高強度・高靭性非調質鋼の製造方法

Publications (2)

Publication Number Publication Date
EP0314145A1 true EP0314145A1 (de) 1989-05-03
EP0314145B1 EP0314145B1 (de) 1992-03-18

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EP88117946A Expired EP0314144B1 (de) 1987-10-29 1988-10-27 Verfahren zur Herstellung von Gegenständen aus hochzähem und hochfestem Stahl
EP88117947A Expired EP0314145B1 (de) 1987-10-29 1988-10-27 Verfahren zur Herstellung von Gegenständen aus hochzähem und hochfestem Stahl

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US (2) US4952250A (de)
EP (2) EP0314144B1 (de)
JP (1) JPH0696742B2 (de)
DE (2) DE3871327D1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2505999B2 (ja) * 1991-07-09 1996-06-12 新日本製鐵株式会社 超高温熱間鍛造方法
JPH11140585A (ja) * 1997-09-05 1999-05-25 Timken Co:The 最適強靭性を有する熱処理鋼
US7005016B2 (en) * 2000-01-07 2006-02-28 Dofasco Inc. Hot rolled steel having improved formability
JP5620336B2 (ja) * 2011-05-26 2014-11-05 新日鐵住金株式会社 高疲労強度、高靭性機械構造用鋼部品およびその製造方法
CN103201401B (zh) * 2011-05-26 2014-07-02 新日铁住金株式会社 机械结构用钢部件及其制造方法
KR20130083925A (ko) 2011-05-26 2013-07-23 신닛테츠스미킨 카부시키카이샤 기계 구조용 강 부품 및 그 제조 방법
FI20125063L (fi) * 2012-01-19 2013-07-20 Rautaruukki Oyj Menetelmä sääkestävän kuumavalssatun ultralujan rakenneterästuotteen valmistamiseksi ja sääkestävä kuumavalssattu ultraluja rakenneterästuote

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1116254A (en) * 1964-06-18 1968-06-06 Yawata Iron & Steel Co Weldable high tensile strength steel capable of giving weld heat-affected zone having high toughness and joint strength
FR2296017A1 (fr) * 1974-12-23 1976-07-23 Stora Kopparbergs Bergslags Ab Procede pour la fabrication d'une chaine a haute resistance et produit ainsi obtenu
FR2333047A1 (fr) * 1975-11-28 1977-06-24 Centro Speriment Metallurg Procede pour la production d'acier a structure mecaniquement anisotrope et aciers obtenus par ce procede
DE3007560A1 (de) * 1980-02-28 1981-09-03 Kawasaki Steel Corp., Kobe, Hyogo Verfahren zum herstellen von warmgewalztem blech mit niedriger streckspannung, hoher zugfestigkeit und ausgezeichnetem formaenderungsvermoegen
GB2163454A (en) * 1984-07-04 1986-02-26 Nippon Steel Corp Non-heat refined steel
US4584032A (en) * 1982-12-10 1986-04-22 Daido Steel Company Limited Bolting bar material and a method of producing the same
EP0191873A1 (de) * 1985-02-16 1986-08-27 Ovako Steel Oy Ab Verfahren und legierter Stahl zum Herstellen hochfester Schmiedestücke

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5934211B2 (ja) * 1980-03-24 1984-08-21 住友金属工業株式会社 高延性を有する複合組識型高張力熱延鋼板の製造法
JPS601929B2 (ja) * 1980-10-30 1985-01-18 新日本製鐵株式会社 強靭鋼の製造法
JPS58171526A (ja) * 1982-03-31 1983-10-08 Nippon Steel Corp 極低温用鋼の製造法
JPS59100256A (ja) * 1982-11-30 1984-06-09 Nippon Kokan Kk <Nkk> 靭性の優れた熱間鍛造用非調質鋼
JPS60103161A (ja) * 1983-11-10 1985-06-07 Nippon Steel Corp 熱間鍛造用非調質棒鋼
JPS61139646A (ja) * 1984-12-12 1986-06-26 Nippon Steel Corp 熱間鍛造用非調質棒鋼
JPS6119761A (ja) * 1984-07-04 1986-01-28 Nippon Steel Corp 高靭性熱鍛非調質棒鋼
JPS6133418A (ja) * 1984-07-20 1986-02-17 Tokico Ltd 移載装置
JPS6167717A (ja) * 1984-09-10 1986-04-07 Kobe Steel Ltd 溶接熱影響部の強度及び靭性にすぐれた高張力鋼板の製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1116254A (en) * 1964-06-18 1968-06-06 Yawata Iron & Steel Co Weldable high tensile strength steel capable of giving weld heat-affected zone having high toughness and joint strength
FR2296017A1 (fr) * 1974-12-23 1976-07-23 Stora Kopparbergs Bergslags Ab Procede pour la fabrication d'une chaine a haute resistance et produit ainsi obtenu
FR2333047A1 (fr) * 1975-11-28 1977-06-24 Centro Speriment Metallurg Procede pour la production d'acier a structure mecaniquement anisotrope et aciers obtenus par ce procede
DE3007560A1 (de) * 1980-02-28 1981-09-03 Kawasaki Steel Corp., Kobe, Hyogo Verfahren zum herstellen von warmgewalztem blech mit niedriger streckspannung, hoher zugfestigkeit und ausgezeichnetem formaenderungsvermoegen
US4584032A (en) * 1982-12-10 1986-04-22 Daido Steel Company Limited Bolting bar material and a method of producing the same
GB2163454A (en) * 1984-07-04 1986-02-26 Nippon Steel Corp Non-heat refined steel
EP0191873A1 (de) * 1985-02-16 1986-08-27 Ovako Steel Oy Ab Verfahren und legierter Stahl zum Herstellen hochfester Schmiedestücke

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 247 (C-307)[1970], 3rd October 1985; & JP-A-60 103 161 (SHIN NIPPON SEITETSU K.K.) 07-06-1985 *

Also Published As

Publication number Publication date
EP0314144A1 (de) 1989-05-03
US4952250A (en) 1990-08-28
JPH01116032A (ja) 1989-05-09
DE3871327D1 (de) 1992-06-25
EP0314144B1 (de) 1992-05-20
US4936926A (en) 1990-06-26
JPH0696742B2 (ja) 1994-11-30
DE3869320D1 (de) 1992-04-23
EP0314145B1 (de) 1992-03-18

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